Lauriel the Vampire Slayer
Werewolves were humans suffering from a curse called Lycanthropy, that caused them to transform into a lupine creatures, particularly during full moon nights. A person became a werewolf when they were bitten by another werewolf and survived. It did not matter if the original werewolf was transformed or not at the moment the bite took place. Scratches did not change a person, nor was the condition genetically passable to offspring.
From the point of being bitten and on, the victim transformed into a lupine creature and remained so from sunset to sunrise during the three nights of the full moon1, or alternatively from moonrise to moonset, depending on species. It should be noted that a newly-bitten werewolf would not transform until the falling of the next full moon night, even if the bite was received during a night of the full moon itself. When transmuted, the human side of the psyche was completely dormant, taken over by a feral predatory mentality that knew only the hunt.